I suspect Amos Martin did not serve in the U S Military during the war with Mexico. I requested a copy of his Mexican War Bounty Land application from the National Archives and they could not find one. Perhaps he served as a contractor or teamster or some other civilian capacity for which he would not be entitled to a land warrant or Mexican War Pension. Perhaps his civil war pension record will have more information. Also, sometimes the soldier's name was recorded incorrectly or they used an alias.